1 /*- 2 * Copyright (c) 2014 Baptiste Daroussin <bapt@FreeBSD.org> 3 * Copyright (c) 2014 Vsevolod Stakhov <vsevolod@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer 11 * in this position and unchanged. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #include <sys/procctl.h> 30 #include <sys/time.h> 31 #include <sys/wait.h> 32 33 #include <err.h> 34 #include <errno.h> 35 #include <getopt.h> 36 #include <signal.h> 37 #include <stdarg.h> 38 #include <stdbool.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #define EXIT_TIMEOUT 124 45 #define EXIT_INVALID 125 46 #define EXIT_CMD_ERROR 126 47 #define EXIT_CMD_NOENT 127 48 49 static volatile sig_atomic_t sig_chld = 0; 50 static volatile sig_atomic_t sig_term = 0; 51 static volatile sig_atomic_t sig_alrm = 0; 52 static const char *command = NULL; 53 static bool verbose = false; 54 55 static void __dead2 56 usage(void) 57 { 58 fprintf(stderr, 59 "Usage: %s [-f | --foreground] [-k time | --kill-after time]" 60 " [-p | --preserve-status] [-s signal | --signal signal] " 61 " [-v | --verbose] <duration> <command> [arg ...]\n", 62 getprogname()); 63 exit(EXIT_FAILURE); 64 } 65 66 static void 67 logv(const char *fmt, ...) 68 { 69 va_list ap; 70 71 if (!verbose) 72 return; 73 74 va_start(ap, fmt); 75 vwarnx(fmt, ap); 76 va_end(ap); 77 } 78 79 static double 80 parse_duration(const char *duration) 81 { 82 double ret; 83 char *suffix; 84 85 ret = strtod(duration, &suffix); 86 if (suffix == duration) 87 errx(EXIT_INVALID, "duration is not a number"); 88 89 if (*suffix == '\0') 90 return (ret); 91 92 if (suffix[1] != '\0') 93 errx(EXIT_INVALID, "duration unit suffix too long"); 94 95 switch (*suffix) { 96 case 's': 97 break; 98 case 'm': 99 ret *= 60; 100 break; 101 case 'h': 102 ret *= 60 * 60; 103 break; 104 case 'd': 105 ret *= 60 * 60 * 24; 106 break; 107 default: 108 errx(EXIT_INVALID, "duration unit suffix invalid"); 109 } 110 111 if (ret < 0 || ret >= 100000000UL) 112 errx(EXIT_INVALID, "duration out of range"); 113 114 return (ret); 115 } 116 117 static int 118 parse_signal(const char *str) 119 { 120 int sig, i; 121 const char *errstr; 122 123 sig = strtonum(str, 1, sys_nsig - 1, &errstr); 124 if (errstr == NULL) 125 return (sig); 126 127 if (strncasecmp(str, "SIG", 3) == 0) 128 str += 3; 129 for (i = 1; i < sys_nsig; i++) { 130 if (strcasecmp(str, sys_signame[i]) == 0) 131 return (i); 132 } 133 134 errx(EXIT_INVALID, "invalid signal"); 135 } 136 137 static void 138 sig_handler(int signo) 139 { 140 switch (signo) { 141 case SIGINT: 142 case SIGHUP: 143 case SIGQUIT: 144 case SIGTERM: 145 sig_term = signo; 146 break; 147 case SIGCHLD: 148 sig_chld = 1; 149 break; 150 case SIGALRM: 151 sig_alrm = 1; 152 break; 153 } 154 } 155 156 static void 157 send_sig(pid_t pid, int signo, bool foreground) 158 { 159 struct procctl_reaper_kill rk; 160 161 logv("sending signal %s(%d) to command '%s'", 162 sys_signame[signo], signo, command); 163 if (foreground) { 164 if (kill(pid, signo) == -1) 165 warnx("kill(%d, %s)", (int)pid, sys_signame[signo]); 166 } else { 167 memset(&rk, 0, sizeof(rk)); 168 rk.rk_sig = signo; 169 if (procctl(P_PID, getpid(), PROC_REAP_KILL, &rk) == -1) 170 warnx("procctl(PROC_REAP_KILL)"); 171 else if (rk.rk_fpid > 0) 172 warnx("failed to signal some processes: first pid=%d", 173 (int)rk.rk_fpid); 174 logv("signaled %u processes", rk.rk_killed); 175 } 176 177 /* 178 * If the child process was stopped by a signal, POSIX.1-2024 179 * requires to send a SIGCONT signal. However, the standard also 180 * allows to send a SIGCONT regardless of the stop state, as we 181 * are doing here. 182 */ 183 if (signo != SIGKILL && signo != SIGSTOP && signo != SIGCONT) { 184 logv("sending signal %s(%d) to command '%s'", 185 sys_signame[SIGCONT], SIGCONT, command); 186 if (foreground) { 187 kill(pid, SIGCONT); 188 } else { 189 memset(&rk, 0, sizeof(rk)); 190 rk.rk_sig = SIGCONT; 191 procctl(P_PID, getpid(), PROC_REAP_KILL, &rk); 192 } 193 } 194 } 195 196 static void 197 set_interval(double iv) 198 { 199 struct itimerval tim; 200 201 memset(&tim, 0, sizeof(tim)); 202 if (iv > 0) { 203 tim.it_value.tv_sec = (time_t)iv; 204 iv -= (double)(time_t)iv; 205 tim.it_value.tv_usec = (suseconds_t)(iv * 1000000UL); 206 } 207 208 if (setitimer(ITIMER_REAL, &tim, NULL) == -1) 209 err(EXIT_FAILURE, "setitimer()"); 210 } 211 212 int 213 main(int argc, char **argv) 214 { 215 int ch, status, sig; 216 int pstat = 0; 217 int killsig = SIGTERM; 218 size_t i; 219 pid_t pid, cpid; 220 double first_kill; 221 double second_kill = 0; 222 bool foreground = false; 223 bool preserve = false; 224 bool timedout = false; 225 bool do_second_kill = false; 226 bool child_done = false; 227 struct sigaction signals; 228 struct procctl_reaper_status info; 229 int signums[] = { 230 -1, 231 SIGTERM, 232 SIGINT, 233 SIGHUP, 234 SIGCHLD, 235 SIGALRM, 236 SIGQUIT, 237 }; 238 239 const char optstr[] = "+fhk:ps:v"; 240 const struct option longopts[] = { 241 { "foreground", no_argument, NULL, 'f' }, 242 { "help", no_argument, NULL, 'h' }, 243 { "kill-after", required_argument, NULL, 'k' }, 244 { "preserve-status", no_argument, NULL, 'p' }, 245 { "signal", required_argument, NULL, 's' }, 246 { "verbose", no_argument, NULL, 'v' }, 247 { NULL, 0, NULL, 0 }, 248 }; 249 250 while ((ch = getopt_long(argc, argv, optstr, longopts, NULL)) != -1) { 251 switch (ch) { 252 case 'f': 253 foreground = true; 254 break; 255 case 'k': 256 do_second_kill = true; 257 second_kill = parse_duration(optarg); 258 break; 259 case 'p': 260 preserve = true; 261 break; 262 case 's': 263 killsig = parse_signal(optarg); 264 break; 265 case 'v': 266 verbose = true; 267 break; 268 case 0: 269 break; 270 default: 271 usage(); 272 } 273 } 274 275 argc -= optind; 276 argv += optind; 277 if (argc < 2) 278 usage(); 279 280 first_kill = parse_duration(argv[0]); 281 argc--; 282 argv++; 283 command = argv[0]; 284 285 if (!foreground) { 286 /* Acquire a reaper */ 287 if (procctl(P_PID, getpid(), PROC_REAP_ACQUIRE, NULL) == -1) 288 err(EXIT_FAILURE, "procctl(PROC_REAP_ACQUIRE)"); 289 } 290 291 memset(&signals, 0, sizeof(signals)); 292 sigemptyset(&signals.sa_mask); 293 294 if (killsig != SIGKILL && killsig != SIGSTOP) 295 signums[0] = killsig; 296 297 for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i++) 298 sigaddset(&signals.sa_mask, signums[i]); 299 300 signals.sa_handler = sig_handler; 301 signals.sa_flags = SA_RESTART; 302 303 for (i = 0; i < sizeof(signums) / sizeof(signums[0]); i++) { 304 if (signums[i] > 0 && 305 sigaction(signums[i], &signals, NULL) == -1) 306 err(EXIT_FAILURE, "sigaction()"); 307 } 308 309 /* Don't stop if background child needs TTY */ 310 signal(SIGTTIN, SIG_IGN); 311 signal(SIGTTOU, SIG_IGN); 312 313 pid = fork(); 314 if (pid == -1) { 315 err(EXIT_FAILURE, "fork()"); 316 } else if (pid == 0) { 317 /* child process */ 318 signal(SIGTTIN, SIG_DFL); 319 signal(SIGTTOU, SIG_DFL); 320 321 execvp(argv[0], argv); 322 warn("exec(%s)", argv[0]); 323 _exit(errno == ENOENT ? EXIT_CMD_NOENT : EXIT_CMD_ERROR); 324 } 325 326 /* parent continues here */ 327 328 if (sigprocmask(SIG_BLOCK, &signals.sa_mask, NULL) == -1) 329 err(EXIT_FAILURE, "sigprocmask()"); 330 331 set_interval(first_kill); 332 sigemptyset(&signals.sa_mask); 333 334 for (;;) { 335 sigsuspend(&signals.sa_mask); 336 337 if (sig_chld) { 338 sig_chld = 0; 339 340 while ((cpid = waitpid(-1, &status, WNOHANG)) != 0) { 341 if (cpid < 0) { 342 if (errno != EINTR) 343 break; 344 } else if (cpid == pid) { 345 pstat = status; 346 child_done = true; 347 } 348 } 349 if (child_done) { 350 if (foreground) { 351 break; 352 } else { 353 procctl(P_PID, getpid(), 354 PROC_REAP_STATUS, &info); 355 if (info.rs_children == 0) 356 break; 357 } 358 } 359 } else if (sig_alrm || sig_term) { 360 if (sig_alrm) { 361 sig = killsig; 362 sig_alrm = 0; 363 timedout = true; 364 } else { 365 sig = sig_term; 366 sig_term = 0; 367 } 368 369 send_sig(pid, sig, foreground); 370 371 if (do_second_kill) { 372 set_interval(second_kill); 373 do_second_kill = false; 374 killsig = SIGKILL; 375 } 376 } 377 } 378 379 if (!foreground) 380 procctl(P_PID, getpid(), PROC_REAP_RELEASE, NULL); 381 382 if (timedout && !preserve) { 383 pstat = EXIT_TIMEOUT; 384 } else { 385 if (WIFEXITED(pstat)) 386 pstat = WEXITSTATUS(pstat); 387 else if (WIFSIGNALED(pstat)) 388 pstat = 128 + WTERMSIG(pstat); 389 } 390 391 return (pstat); 392 } 393